Compute the area of an equilateral triangle with a side of 1 foot in length.
First find the length of the altitude:
Do this by dividing the equilateral triangle into two equal right triangles. Each right triangle has:
a the same altitude as the equilateral triangle
b base is half the side of equilateral triangle = 1/2 foot
c hypotenuse of one side = 1 foot
Then for the equilateral triangle:
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